Kāneʻohe Bay, at 45 km2 (17 sq mi), is the largest sheltered body of water in the main Hawaiian Islands.

This reef-dominated embayment constitutes a significant scenic and recreational feature along the northeast coast of the Island of Oʻahu.

The lagoon contains extensive patch and fringing reefs and its southern end is partly enclosed by the Mokapu Peninsula.

A sand bar (Ahu o Laka), Kapapa, and Kekepa (Turtleback Rock) are all islets on the barrier reef.

Coconut Island is an isolated volcanic remnant located in the southwest part of the bay.